Supporters of both teams became embroiled in a brawl on Friday as they prepared to fly to Milan for Saturday's match.

According to Spanish outlet Sport, the fracas took place without a single security member present and it was half an hour before the civil guard showed up.

Real Madrid and Atletico will do battle in a repeat of the 2014 final which Los Blancos won 4-1 after extra-time.

Cristiano Ronaldo was a fitness doubt for Real Madrid earlier in the week but boss Zinedine Zidane confirmed he will start.

Cristiano Ronaldo is fully fit and will start for Real Madrid in the final (Image: Reuters / Tony Gentile)

The Frenchman confirmed the problem which caused Ronaldo to limp out of a training session on Tuesday was unrelated to the hamstring issue which saw the winger miss three games towards the end of April.

"It is not the same thing - he had a little issue but he is fine now," Zidane said on Friday. "He is 100 percent and with it being a final, even if he had anything he would still play.

"I believe he is fine. It is a different issue to [before City]. Tomorrow he will be at 100 percent."